Quoting rplaurent:

Quote:
I purchased this for my samsung 4 and downloaded online database and no thumbnails appear

Hi!
  I have a different phone and have had this happen. I wasn't willing to troubleshoot the problem when it happened, later when I opened the app the thumbnails were there.
Your second alternative would be to change the image size, down a notch, up a notch and sync the phone. This usually will solve the issue.

Dave